#set( $symbol_pound = '#' )
#set( $symbol_dollar = '$' )
#set( $symbol_escape = '\' )
/**
 * 
 */
package ${package}.realm;

import java.io.Serializable;
import java.util.Objects;

import javax.annotation.PostConstruct;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.AccountException;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.DisabledAccountException;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.beans.factory.annotation.Autowired;

import ${package}.exception.ValidateCodeException;
import ${package}.model.User;
import ${package}.service.UserService;
import ${package}.token.UsernamePasswordCaptchaToken;
import ${package}.utils.Encodes;

/**
 * @author WMS
 * 
 */
public class UserRealm extends AuthorizingRealm {

	public static final String HASH_ALGORITHM = "SHA-1";
	public static final int HASH_INTERATIONS = 1024;

	@Autowired
	private UserService userservice;

	public void setUserservice(UserService userservice) {
		this.userservice = userservice;
	}

	/**
	 * 授权查询回调函数, 进行鉴权但缓存中无用户的授权信息时调用.
	 */
	@Override
	protected AuthorizationInfo doGetAuthorizationInfo(
			PrincipalCollection principals) {
		ShiroUser shiroUser = (ShiroUser) principals.getPrimaryPrincipal();
		User user = userservice.findById(shiroUser.loginName);
		SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
		info.addRole(user.getRole());
		/*
		 * for (Role role : user.getRoles()) { // 基于Role的权限信息
		 * info.addRole(role.getRole()); // 基于Permission的权限信息
		 * info.addStringPermissions(role.getPermissionList()); }
		 */
		return info;
	}

	/**
	 * 认证回调函数,登录时调用.
	 */
	@Override
	protected AuthenticationInfo doGetAuthenticationInfo(
			AuthenticationToken authcToken) throws AuthenticationException {

		UsernamePasswordCaptchaToken token = (UsernamePasswordCaptchaToken) authcToken;

		if (token.getUsername() == null) {
			throw new AccountException("提交表单未包含用户名.");
		}

		// 增加判断验证码逻辑
		String captcha = token.getCaptcha();
		String exitCode = (String) SecurityUtils.getSubject().getSession()
				.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
		if (null == captcha || !captcha.equalsIgnoreCase(exitCode)) {
			throw new ValidateCodeException("验证码错误");
		}

		User user = userservice.findById(token.getUsername());
		if (user != null) {
			if (user.isDisable()) {
				throw new DisabledAccountException();
			}
			byte[] salt = Encodes.decodeHex(user.getSalt());
			return new SimpleAuthenticationInfo(new ShiroUser(user.getId(),
					user.getName()), user.getPassword(),
					ByteSource.Util.bytes(salt), getName());
		}
		return null;
	}

	/**
	 * 设定Password校验的Hash算法与迭代次数.
	 */
	@PostConstruct
	public void initCredentialsMatcher() {
		HashedCredentialsMatcher matcher = new HashedCredentialsMatcher(
				HASH_ALGORITHM);
		matcher.setHashIterations(HASH_INTERATIONS);
		setCredentialsMatcher(matcher);
	}

	/**
	 * 自定义Authentication对象，使得Subject除了携带用户的登录名外还可以携带更多信息.
	 */
	public static class ShiroUser implements Serializable {
		private static final long serialVersionUID = -1373760761780840081L;
		public String loginName;
		public String name;

		public ShiroUser(String loginName, String name) {
			this.loginName = loginName;
			this.name = name;
		}

		public String getName() {
			return name;
		}

		/**
		 * 本函数输出将作为默认的<shiro:principal/>输出.
		 */
		@Override
		public String toString() {
			return loginName;
		}

		/**
		 * 重载hashCode,只计算loginName;
		 */
		@Override
		public int hashCode() {
			return Objects.hashCode(loginName);
		}

		/**
		 * 重载equals,只计算loginName;
		 */
		@Override
		public boolean equals(Object obj) {
			if (this == obj) {
				return true;
			}
			if (obj == null) {
				return false;
			}
			if (getClass() != obj.getClass()) {
				return false;
			}
			ShiroUser other = (ShiroUser) obj;
			if (loginName == null) {
				if (other.loginName != null) {
					return false;
				}
			} else if (!loginName.equals(other.loginName)) {
				return false;
			}
			return true;
		}
	}

}
